Electric-arc lamp.



No; 775,442. 7 PATENTBD NOV. 22, 1904. T; L. GARBONE.

ELECTRIC ARC LAMP.

APPLICATION FILED APR.19, 1904.

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M a/wr No. 775,442. PATENTED NOV. 22, 1904. T. L. OARBONE.

ELECTRIC ARC LAMP. APPLICATION FILED APR. 19, 1904. no MODEL. 2SHEETS-SHEET 2.

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UNITED STATES Patented November 22, 1904.

TITO LIVIO CARBONE, OF BERLIN, GERMANY.

ELECTRIC-ARC LAMP.

. SPECIFICATION forming part of Letters Patent No. 775,442, datedNovember 22, 1904..

Application filed April 19, 1904.

To all whom, it may concern:

Be it known that I, TITo LIvIo OARBONE, engineer, a subject of the Kingof Italy, residing at Berlin, Germany, have invented certain new anduseful Improvements in Electric-Arc Lamps; and I do hereby declare thatthe following is a full, clear, and exact descrip tion.

My present invention relates to an arc-lamp with convergent carbonsdirected downward, the carbons being carried by a sleeve pro vided withlateral arms and embracing two movably-connected bars. The sleeve isheld on the two bars by friction if the bars are moved away from eachother by the action of an electromagnet. If the two bars are, on thecontrary, moved closer together, then they allow of the sleeve sinkingdown according as the carbons burn off. The sleeve has an arm and linkedthereon a brake-block which constantly presses against the one bar. Bythis arrangement the sleeve is prevented from sinking too quickly if thetwo bars are moved together for regulating the length of the arc. Thetwo bars passing through the sleeve are connected with the iron core ofan electromagnet by means of a two-armed lever, which moves the two barsaway from each other by the action of the electromagnet. One bar has aone-armed slotted lever linked on it, and a pin of the other bar passesthrough said slot and also through the two-armed lever mentioned before.The one-armed lever has a regulating-screw in its free end, adapted tostrike against the frame of the lamp if a certain length of the carbonshas burned away, so that a further sinking of the sleeve carrying thecarbons becomes necessary. If the free end of the one-armed leverstrikes against the lamp-frame, it is swung a little, whereby the twobars are moved together, so that the sleeve sliding on said bars isallowed to sink.

In order to make myself better understood, I have shown on theaccompanying drawings, by way of example, one form of my new arelamp.

Figure 1 is a front View. Fig. 2 is a side view. Fig. 3 is a verticalcentral section of the lamp. Fig. 4 is a section on line 4 4 in Fig. 1.Fig. 5 is a detail front view showing Serial No. 203,909- (No model.)

the arrangement of the two bars and the two levers. Fig. 6 is a sideview of the same. Fig. 7 is a section on line 7 7 in Fig. 5. Fig. 8 is adetail sectional view of the brake mechanism. Fig. 9 is a plan of thesame. Fig. 10 is a side view of the arm and the brakeblock. Figs. 11 and12 are a front and side View of the carbon-clamps and their attachmentto the carbon-carrier.

1 is the upper part, and 2 the lower part, of the lamp-frame, said partsbeing connected by four rods 3 4 5 6, inclined in the direction of thecarbons. A bow 7 is mounted on the upper part 1 and carries the spools 89. The iron core 10 of this electromagnet is linked to the two-armedlever ll by the pin 12. The lever 11 is further movably connected withthe bar 15 by the pin 14 and with the bar 13 by the pin 16. The bars 1315 are connected by arms 17 and are separated from each other if theiron core 10 of the electromagnet is lifted and hold then by frictionthe sleeve 19, provided with lateral arms 18. A onearmed lever 20 islinked to the bar 15 by pin 21. The lever 20 is bifurcated at one end,Fig. 7. A pin 16passes through slots 22, provided in both parts of thefork, which pin connects the bar 15 with the two-armed lever 11. Thefree end of the lever 20 is provided with a regulating-screw 23,striking against the plate 1 if a certain length of the carbons hasburned away, so thatafurther sinking of the sleeve 19, carrying thecarbons, becomes necessary. The free end of the lever 20 is furtherprovided with a spring 24 in order to make the touch of the screw 23 andthe plate 1 as soft as possible. If the screw 23 strikes against theplate 1 while the iron core 10 sinks farther, the two bars 13 15 aremoved closer together because of the lever 20, pivoted at 21, liftingthe bar 13 with respect to the bar 15, so that the bars 13 15 arecompelled by the arm 17 to come closer together. This approach of thebars 13 15 takes place each time the iron core has moved down a certainamount, according as p the carbons burn off. As the bars 13 15 approachthe sleeve 19, carrying the carbons, becomes free and slides downward.Because of this movement of the sleeve 19 the iron core 10 is againattracted, so that the screw 23 does no longer touch the plate 1.Therefore the bars 13 15 are again carried alone by the iron core bymeans of the two-armed lever 11. Now the bars 13 15 are again moved awayfrom each other and hold the sleeve 19 by friction.

An arm 26 is eccentrically pivoted on the sleeve 19 by means of a pin25, said arm having a projection 27 in contact with the bar 15, Figs. 7to 10. A brake-block 28 is movably mounted by a pin 29 on the arm 26.The whole friction-surface of the block 28 is always pressed against thebar 15 by the weight of the arm 26. In order to allow the necessary playof the block 28, the latter has a slot through which the pin passes. Asthe whole friction-surface of the block 28 is even then in contact withthe bar 15 when the bars 13 15 are approached, the downward movement ofthe sleeve is braked and a very soft play is therefore obtained.

The are and the spool 8 of the electromagnet are connected in series,while the spool 9 is shunted with the arc.

The carbons 3 135 pass through the vaulted lower plate 2, so that thearc is formed under the refractor 31. Two electron'iagnets 32 arearranged on the plate 2 and have their upper ends connected by across-piece 3, provided with a hole which serves as a guide for thelower end of the bar 15.

Each carbon 34 35 is liXed in a spring-clamp 36, Figs. 11, 12, which iseccentrically suspended by means of a pin 37 on a piece 38, sliding onand guided by the rods 3 4. or 5 6, respectively. Each-piece 38 restsupon one arm, 18, of the sleeve 19 by means of a roller 89, so that thetwo sliding pieces can move closer together as the carbons burn away andas the sleeve 19 sinks down.

Having now described my invention and in what manner the same is to beperformed,

what I claim, and desire to secure by Letters Patent, is

1. In an arclamp, a frame comprising a base and top piece, inclined barsconnecting said base and top, holders sliding on said inclined bars,carrying converging carbons, two parallel bars movably connectedtogether, a sleeve sliding on said bars and having arms on which thecarbon-holders are laterally slidable. an electromagnet adapted to movethe said parallel bars away from each other and thus holding the sleeve,and means for approaching the bars if a feeding of the carbon becomesnecessary, substantially as described.

2. In an arc-lamp two parallel bars movably connected together, a sleeveadapted to slide on, and embracing said bars and having arms carryingthe carbons, an electromagnet adapted to move the said bars away fromeach other and thus holding the sleeve, and means for approaching thebars if a feeding of the carbons becomes necessary, the sleeve having amovable arm and a brake-block linked to the latter, substantially asdescribed.

3. In an arc-lamp, two parallel bars connected together by a pluralityof arms, an elec tromagnet, a two-armed lever connecting said rods withthe iron core of the electromagnet, a one-armed lever linked at one endto one of the said bars, embracing with a slot a pin ot' the other ofthe said bars, and provided at its free end with a screw adapted tostrike against a stop of the lamp, and a sleeve adapted to slide on, andembracing said bars and having arms carrying the carbons, substantiallyas described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

TITO LIVIO CARBONE. \Vitnesses:

ARTHUR KRX'PZER, W ILIL G'ODAU.

